The active phase and support effect on V2O5/Y2O3 catalysts for propane oxidative dehydrogenation

Wei De Zhang; Chak Tong Au; Hui Lin Wan

doi:10.1016/S0926-860X(98)00412-8

The active phase and support effect on V₂O₅/Y₂O₃ catalysts for propane oxidative dehydrogenation

Wei De Zhang^*, Chak Tong Au, Hui Lin Wan

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

17 Citations (Scopus)

Abstract

The V₂O₅/Y₂O₃ catalysts were prepared and characterized. The performance of the catalysts in propane oxidative dehydrogenation was examined. The active phase of the catalysts is YVO₄. The effects of Y₂O₃ and V₂O₅ in the catalyst on the reaction could be explained by their acid-base character. The promoting effect of Nb₂O₅ on YVO₄ catalyst has been also discussed. The nature of the active sites of the catalysts was studied by means of ESR, NO-TPD and ¹⁸O₂-isotope exchange methods. The results of ESR and NO-TPD confirmed the existence of V⁴⁺ in the catalyst. ¹⁸O₂-isotope exchange revealed that the activation of oxygen took place on the V⁴⁺ site associated with oxygen vacancies. The activation of O₂ is beneficial for the oxidative dehydrogenation of propane.

Original language	English
Pages (from-to)	63-69
Number of pages	7
Journal	Applied Catalysis A: General
Volume	181
Issue number	1
DOIs	https://doi.org/10.1016/S0926-860X(98)00412-8
Publication status	Published - 3 May 1999

Scopus Subject Areas

Catalysis
Process Chemistry and Technology

User-Defined Keywords

Active phase
Oxidative dehydrogenation
Propane
Support effect
V species

Access to Document

10.1016/S0926-860X(98)00412-8

Cite this

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title = "The active phase and support effect on V2O5/Y2O3 catalysts for propane oxidative dehydrogenation",

abstract = "The V2O5/Y2O3 catalysts were prepared and characterized. The performance of the catalysts in propane oxidative dehydrogenation was examined. The active phase of the catalysts is YVO4. The effects of Y2O3 and V2O5 in the catalyst on the reaction could be explained by their acid-base character. The promoting effect of Nb2O5 on YVO4 catalyst has been also discussed. The nature of the active sites of the catalysts was studied by means of ESR, NO-TPD and 18O2-isotope exchange methods. The results of ESR and NO-TPD confirmed the existence of V4+ in the catalyst. 18O2-isotope exchange revealed that the activation of oxygen took place on the V4+ site associated with oxygen vacancies. The activation of O2 is beneficial for the oxidative dehydrogenation of propane.",

keywords = "Active phase, Oxidative dehydrogenation, Propane, Support effect, V species",

author = "Zhang, {Wei De} and Au, {Chak Tong} and Wan, {Hui Lin}",

note = "Funding Information: The financial support of this work by National Nature Science Foundation of China was gratefully acknowledged.",

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T1 - The active phase and support effect on V2O5/Y2O3 catalysts for propane oxidative dehydrogenation

AU - Zhang, Wei De

AU - Au, Chak Tong

AU - Wan, Hui Lin

N1 - Funding Information: The financial support of this work by National Nature Science Foundation of China was gratefully acknowledged.

PY - 1999/5/3

Y1 - 1999/5/3

N2 - The V2O5/Y2O3 catalysts were prepared and characterized. The performance of the catalysts in propane oxidative dehydrogenation was examined. The active phase of the catalysts is YVO4. The effects of Y2O3 and V2O5 in the catalyst on the reaction could be explained by their acid-base character. The promoting effect of Nb2O5 on YVO4 catalyst has been also discussed. The nature of the active sites of the catalysts was studied by means of ESR, NO-TPD and 18O2-isotope exchange methods. The results of ESR and NO-TPD confirmed the existence of V4+ in the catalyst. 18O2-isotope exchange revealed that the activation of oxygen took place on the V4+ site associated with oxygen vacancies. The activation of O2 is beneficial for the oxidative dehydrogenation of propane.

AB - The V2O5/Y2O3 catalysts were prepared and characterized. The performance of the catalysts in propane oxidative dehydrogenation was examined. The active phase of the catalysts is YVO4. The effects of Y2O3 and V2O5 in the catalyst on the reaction could be explained by their acid-base character. The promoting effect of Nb2O5 on YVO4 catalyst has been also discussed. The nature of the active sites of the catalysts was studied by means of ESR, NO-TPD and 18O2-isotope exchange methods. The results of ESR and NO-TPD confirmed the existence of V4+ in the catalyst. 18O2-isotope exchange revealed that the activation of oxygen took place on the V4+ site associated with oxygen vacancies. The activation of O2 is beneficial for the oxidative dehydrogenation of propane.

KW - Active phase

KW - Oxidative dehydrogenation

KW - Propane

KW - Support effect

KW - V species

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